The DRZ42377 is a 44U two-post open frame relay rack from the DRZ4 Series, built for telecom central offices, carrier facilities, critical infrastructure and data centers that must document certified seismic performance. It uses 23.00 in (584 mm) mounting width rails, making it suited to 23-inch telecom equipment rather than 19-inch EIA hardware.

Construction is 10-gauge welded mild steel with a RAL9005 black powder coat thin-film finish. The welded framework, structural base and freestanding, bolt-down design were part of the configuration independently tested under Telcordia GR-63-CORE Section 4.4.1 Zone 4 test severity (Telcordia report DA-1999), where the DRZ4 relay rack conformed to requirements for no permanent structural or mechanical damage, maximum deflection under 75 mm, natural mechanical frequency above 2.0 Hz, welded framework construction and base mounting without auxiliary support. The series is also UL2416 listed with a 2000 lb load rating (UL file E474597) and is seismic rated to 800 lb dynamic load with a bolt-down kit in accordance with GR-63-CORE.

Overall dimensions are 84.00 in x 26.75 in x 18.00 in (2,134 mm x 679 mm x 457 mm), with 77.12 in (1959 mm) of 44U mounting height and 6.00 in (152 mm) mounting depth. Shipping weight is 85 lbs (38.56 kg).

• Double-tapped 10-32 rails with 10-32 E.I.A. spacing front and rear, plus hole rack unit indicators
• Two 10-32 x 1/2 in ground studs at the front and two 10-32 x 1/2 in studs inside the top for bonding
• Base bolt-down holes and mounting provisions for a standard relay rack cable manager

DRZ42377 is TAA-compliant, USMCA compliant, made in Canada, and RoHS and REACH compliant. Two racks can be converted to a four-post configuration with the Four Post Rack Kit (FPRK), and the RIK23Z4 isolation kit matches the 23-inch frame.